Spring planting green onion planting technology
1. Colonization and management
1 to 2 days before planting, the seedbed is watered, the seedling height is 25~30 cm, the top leaves are cut, and the large and small seedlings are graded. When planting, arrange the onion seedlings of the same size in the planting ditch according to the plant spacing of 3~5 cm. Try to make the onion leaves appear perpendicular to the direction of the row, and then cover the soil to embed the bulbs and expose the onion (bifurcation). . After planting, pour the water and feces so that the onion roots are in close contact with the soil. After the green onion seedlings resumed growth, they began to topdress in July, applying 750-1000 kg of manure and urine, or 30-50 kg of compound fertilizer to promote the growth of onion seedlings. In the period of growth of green onions, the use of 50% zinc sulphur phosphorus 350~500 grams, watering 500~700 kg irrigation roots, killing green onion, and then irrigating once every 40 days. Mix and spray with 40% dimethoate 1000 times solution and malathion 1000 times solution to control the thrips. In the rainy and hot weather, the onion rust and purple spot disease are serious. It is necessary to spray copper ammonia mixture, 550 grams of ammonium bicarbonate, 100 grams of copper sulfate, mix well and suffocate in plastic bags for 24 hours, add 250 kg of water, spray control . During the period from August to September, 1000-1500 kg of manure and faecal manure, or 40-60 kg of compound fertilizer, will promote the vigorous growth of onion seedlings. During the growth period, combined with the soil for 2~3 times, the first soil is 7~10 cm thick before the growth period; the second soil is the filling period after the growth period; the third soil height is 13~17. Centimeter, cultivated into a high ridge. The soil should be carried out in the morning or on a cloudy day. Each time the soil can not be buried, the soil particles can not fall into the onion, so as not to cause decay or hinder growth. After the rain or after irrigation, if the soil ridge collapses, it must be replenished in time. During the formation of scallion, 40-50 kg of compound fertilizer and 10-20 kg of phosphorus and potassium fertilizer are applied. Pay attention to watering when it is dry. 2. When the length of the scallion is 25~35cm and the diameter is more than 1.2cm, it can be harvested in batches. The yield per mu can reach 2500~4500 kg.
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